Cache backfilling values -- Related to #2019
Don't trigger the progress bar for shards when changing acks
Properly remove listeners
Merge branch 'michel_2019_blink' into next
Merge branch 'michel_2023_ack' into next
Updated spin_up_cluster usage() message.
Made default directory in spin_up_cluster debug.
Merge branch 'next' into sam_spinupcluster
Merge branch 'sam_spinupcluster' into sam_1998